Adding the assert() that checks for the correct view source highlighting

Source/core/html/parser/HTMLToken.h

Index: Source/core/html/parser/HTMLToken.h
diff --git a/Source/core/html/parser/HTMLToken.h b/Source/core/html/parser/HTMLToken.h
index 9a41636f71c3f5c859dd373d6a87257bc363312e..e2b67fc33aa0894ad2f202b7a7e5fbda7455279b 100644
--- a/Source/core/html/parser/HTMLToken.h
+++ b/Source/core/html/parser/HTMLToken.h
@@ -330,9 +330,7 @@ public:
     {
         ASSERT(character);
         ASSERT(m_type == StartTag || m_type == EndTag);
-        // FIXME: We should be able to add the following ASSERT once we fix
-        // https://bugs.webkit.org/show_bug.cgi?id=62971
-        //   ASSERT(m_currentAttribute->nameRange.start);
+        ASSERT(m_currentAttribute->nameRange.start);
         m_currentAttribute->name.append(character);
     }